Piano-tuning pin



UNITED STATES PATENT OFFICE.

FRANK E. KING, OF WES'I.` LEBANON, NEW HAMPSHIRE.

PIANO-TUNING PlN.

SPECIFICATION forming part of Letters Patent No. 247,363, datedSeptember 20, 1881.

Application filed January 3, 1881.

.To all whom it may concern Be it known that I, FRANK E. KING; of WestLabanon, in the county of Grafton and State of New Hampshire, haveinvented certain new and useful Improvements in Piano- TuningPins, ofwhich the followingis a speciiication.

The object of my invention is to provide a tuning-pin for pianos, whichshall not become loose and move under the force ofthe tension of thestring when repeatedly struck upon-by the hammer when in use, but thatsuch tention as may be required in turning the said string shall remainiixed and positive, thus avoidingthe frequent necessity of retuning, asis common with those heretofore constructed and now in general use; andit consists in the construction, combination, and arrangement of theseveral parts of the device, as hereinafter more fully described and setforth.

Figure l represents a perspective view of my invention. Fig. 2represents a vertical section of the same.

A represents the wrest plank or frame of a piano provided with asuitable series of holes to correspond with the strings B, as usual.Into these holes are securely driven the vertical studs or'pins E,provided with a horizontal hole, G, arranged in the direction of, thestring D, one end ot' which is secured in the usual manner, and theopposite adjustable end passed through a hole, H, formed in the downwardor upward projecting1 end of the adjustable string-holder F, and theslack of the said string B wound around such projecting end portion, theopposite screw-threaded portion having upon its upper surface alongitudinal groove, P, and adapted to tit loosely within the horizontalhole C of the stud or pin E when placed therein, and provided with asuitable screw-nut, N, which may be turned with a wrench or key, so asto tune the said string D, by drawing the said holder F through the (Nomodel.)

hole in the stud or pin E, against which the said screw-threadedtuning-nut has a bearing at its opposite side. When the said string D iscorrectly tuned the set-screw L, fitted into a corresponding hole formedin the top end of the stud or pin E, and having a bearing upon thecheck-bolt K, the upper end of which is provided with a projectingpintle or steadyingpin, J, which lits into a corresponding hol-e in theJlower end ofthe said set-screw L, being turned or screwed inward,forcesthe lower end of the said check-bolt Ktirmly against the bottom ofthegroove P, formed in the string-holder F, so as to prevent vibratorymovement of the saine through its connections with the said vibratingstring D.

Having thus described my invention, what I claim ism l. A piano-tuningpin consisting of the vertical stationary stud or pin E, having ahorizon'- tal hole, G, provided with the adjustable string, holder F,having a downward or upward projecting end adapted to hold the string,and provided with a longitudinal groove, P, to receive the end of thecheck-bolt K, held therein by the set-screw L, the said string-holder Fbeing adjusted by means ot' the screw-threaded nut N so as to tune thestring D, substantially as described` 2. The combination, with thewrest-plank, of

the stationary vertical stud or pin E, having

